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  1. #1

    Join Date
    Jul 2004
    Posts
    8
    Location
    Great State of Alabama
    Tractor
    Massey 281xe

    Default Blow by

    What is blow by and how do I idetify it?

  2. #2

    Join Date
    Apr 2002
    Posts
    110
    Location
    S.W. Missouri
    Tractor
    Century 3045

    Default Re: Blow by

    Blow by is when the ignighted fuel/air mixture in the cylinder "blows by" the piston rings and into the crankcase. You can tell by the smoke coming out of the crankcase vent. Hope this helps

  3. #3

    Join Date
    Aug 2002
    Posts
    7,386
    Location
    North East CT
    Tractor
    2003 Kubota BX-22

    Default Re: Blow by

    Another way to tell is the oil residue at the engine crankcase vent. If it is a modern engine, you will find the oil fill cap "leaking" vapors. If it is real bad, I have seen it push oil out the dipstick tube.

  4. #4
    Epic Contributor
    R.I.P.
    jinman's Avatar
    Join Date
    Feb 2001
    Posts
    21,014
    Location
    Texas - Wise County - Sunset
    Tractor
    NHTC45D, NH LB75B, Ford Jubilee

    Default Re: Blow by

    Several addtional things to look for:

    1. Crankcase oil that gets dirty very quickly.
    2. Remove your oil filler cap with the engine running at low rpm and put your hand over the filler hole. You may be able to feel the puff-puff-puff at very low rpm.
    3. When the engine is hot, remove the oil filler and put a sheet of paper or light cardboard near the filler. It will move with air puffing out. This may be hard to do/see if your fan is also close-by.
    4. With severe blowby, you'll have oil and smoke coming out of any crankcase vent opening.
    5. Do a compression check. All or some cylinders will show low compression. Spray some light oil in the cylinder at the sparkplug hole if it's a gas engine. You should see a big jump in compression with oil in the cylinder.

  5. #5
    Elite Member
    Join Date
    Jul 2003
    Posts
    3,373
    Location
    Goffs Corner, KY
    Tractor
    IH 2444

    Default Re: Blow by

    Blowby ?? isn't that when the politicians come by trying to get your vote ?

  6. #6
    Advertiser sweettractors's Avatar
    Join Date
    Jul 2003
    Posts
    7,205
    Location
    Central Kentucky
    Tractor
    JD 6403 CHA-JD 3130 CHA

    Default Re: Blow by

    Another type of blowby is when a oil ring is broke and usually manifesets the problem with blowby (seeping) around the exaust manifold or out the exaust with splattering of oil when engine throttle is opened a little--Older Ford Diesels are bad about this type blowby--Ken Sweet
    Sweet Farm Equipment LLC *Used Briggs Powered Vegetable/Truck Crop Havesting Aid $995)

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